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Pressure Relief Valve
Poppet Type, Direct-Acting
SAE-8 Cartridge – 420 bar
DB08A-01
38 l/min
420 bar
The pressure relief valve DB08A is a
direct-acting, spring-loaded poppet
valve. Its function is to relieve pressure
in the system. The spring exerts a force
on the poppet and presses it on the
valve seat. On the opposite side, the
system pressure exerts force on port 1
of the valve. Only if the hydraulic force
exceeds the pre-set spring tension does
the valve open and ow is diverted to
tank via port 2. This continues until the
system pressure is equal to the spring
tension and the valve closes again.
Important: Pressures at port 2 are
additive to the opening pressure!
FEATURES
z External surfaces zinc-plated and corrosion-proof
z Max. stroke limiter
z Adjustable throughout ow range
z Optional spring ranges up to 420 bar
z Quick response
z Compact design
z Hardened and ground internal valve components to ensure minimal wear and
extended service life
FUNCTION
SPECIFICATIONS
Operating pressure: max. 420 bar
Nominal ow: max. 38 l/min
Operating pressure ranges: up to 35 bar
up to 62 bar
up to 124 bar
up to 228 bar
up to 345 bar
up to 420 bar
Leakage: leak-free
(max. 5 drops
≙ 0,25 cm³/min at 350 bar)
Media operating temperature range: min. -30 °C to max. +100 °C
Ambient temperature range: min. -30 °C to max. +100 °C
Operating uid: Hydraulic oil to DIN 51524 Part 1 and 2
Viscosity range: min. 7.4 mm²/s to max. 420 mm²/s
Filtration: Class 21/19/16 to ISO 4406
or cleaner
Installation: No orientation restrictions
Materials: Valve body: free-cutting steel
Poppet: hardened and
ground steel
Seals: NBR (standard)
FKM (optional, media
temperature range
-20 °C to +120 °C)
Back-up rings: PTFE
Cavity: FC08-2
Weight: 0.22 kg
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MODEL CODE
DB08A-01 – C – N – 330 V 300
Basic model
Pressure relief valve, UNF
Body and ports*
C = Cartridge only
SB3 = G3/8 ports, steel body
AB3 = G3/8 ports, aluminium body
Seals
N = NBR
V = FKM
Setting pressure range
050 = to 35 bar ( 500 PSI)
090 = to 62 bar ( 900 PSI)
180 = to 124 bar (1800 PSI)
330 = to 228 bar (3300 PSI)
500 = to 345 bar (5000 PSI)
600 = to 420 bar (6000 PSI)
Other pressure ranges on request
Adjustment option
V = Allen head (hex 5/32")
H = Knob adjustment
F = Factory preset, non adjustable
Opening pressure setting
No details = no setting, spring relaxed
... = opening pressure in bar pre-set by manufacturer
Setting on request
CAVITY
FC08-2
DIMENSIONS
Form tools
Tool Part No.
Rougher FC08-2 175473
Reamer FC08-2 175474
millimeter (inch)
subject to technical modications
Standard models
Model code Part No.
DB08A-01-C-V-50V 560416
DB08A-01-C-V-90V 560417
DB08A-01-C-V-1800V 560418
DB08A-01-C-V-330V 560419
DB08A-01-C-V-500V 560420
DB08A-01-C-V-600V 560421
*Standard in-line bodies
Code Part No. Material Ports Pressure
FH082-SB3 560919 Steel, zinc-plated G3/8 420 bar
FH082-AB3 3011423 Aluminium, clear anodized G3/8 210 bar
Seal kits
Code Material Part No.
FS082-N Seal Kit NBR 3033920
FS082-V Seal Kit FKM 3051756
PERFORMANCE
Inlet pressure
Flow
Measured at ν = 34 mm²/s, T
oil
= 46 °C
5/32" hex
9/16" hex
hex 1"
Torque 25
+5
Nm
thick
millimeter (inch)
subject to technical modications
HYDAC Fluidtechnik GmbH
Justus-von-Liebig-Str.
D-66280 Sulzbach/Saar
Tel: 0 68 97 /509-01
Fax: 0 68 97 /509-598
E-Mail: utec@hydac.com
Note
The information in this brochure relates to the
operating conditions and applications described.
For applications or operating conditions not
described, please contact the relevant
technical department. Subject to technical
modications.
